All of my womas have gone through a phase when they try to eat everything. EVERYTHING. Legs, fingers, arms, tongs, hooks, shoes, themselves.....It's not that they're being aggressive but that they are constantly in feeding mode. Mine have all grown out of this phase and are completely docile - on par with the tamest of ball pythons.
I'd lay heavy odds that your "aggressive" one just hasn't outgrown this phase - prior owner probably didn't help by not trying to handle the animal, and leaving feeding as the only association it has with people. If you'll notice in your pics, the snake is not in an aggressive posture - not poised to strike, not hissing, not gaping (open mouth), and yet decided that whatever was in your hand (in this case your camera) was worth trying to eat. I really don't think it's about aggression; I think it just wants to eat EVERYTHING! Feed the heck out of that woma for the next several months and I'll bet that it will calm down a lot.
My experience is that they all go through this phase and that once they outgrow it, they are extremely docile. As adults they will still on occasion exhibit a body-twitching feeding response - they're very touch sensitive because of the way they hunt in rodent burrows, pinning they're prey to the side of the burrow if it's too tight for them to turn around, bite, and coil - but it's very easy to tell and to deal with. Just steer their head away with a hook, water bowl, hide box, etc. and pick them right up - they quickly figure out that it's not about food this time, pop out of feeding mode, and are calm as can be.
For those considering their first Woma, just be aware that their little brains have two gears: feeding mode, and not. When in feeding mode, just show them the appropriate respect. When in not, they are sweet little puppies!
Steve Reiners
BoaMorph
www.BoaMorph.com